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Temporal patterns in different B. trispinosus vocalizations. (A) Duration of individual boatwhistle hoots within a train versus the order in which they occur within the train. (B) Duration of individual grunts within a grunt train versus the order in which they occur within the train. The duration of calls decreases with increasing order within the train (i.e. later calls are shorter), while there is no correlation with interval duration within the train.
